作者机构：
[Yang, Xi-Yan] Yangtze Univ, Sch Phys & Optoelect Engn, Jingzhou 434023, Peoples R China.;[Lai, Xiao-Yu; Tan, Wei-Wei; Yang, Xi-Yan] Hubei Univ Educ, Res Ctr Astron, Wuhan 430205, Peoples R China.;[Tan, Wei-Wei] Cent China Normal Univ, Key Lab Quark & Lepton Phys, Minist Educ, Wuhan 430079, Peoples R China.;[Xu, Ren-Xin] Peking Univ, Sch Phys, Beijing 100871, Peoples R China.;[Xu, Ren-Xin] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China.
通讯机构：
[Lai, XY ] H;Hubei Univ Educ, Res Ctr Astron, Wuhan 430205, Peoples R China.
关键词：
dense matter;(stars:) pulsars: general;(stars:) gamma-ray burst: general
摘要：
Strangeon stars, which are proposed to describe the nature of pulsar-like compact stars, have passed various observational tests. The maximum mass of a non-rotating strangeon star could be high, which implies that the remnants of binary strangeon star mergers could even be long-lived massive strangeon stars. We study rigidly rotating strangeon stars in the slowly rotating approximation, using the Lennard-Jones model for the equation of state. Rotation can significantly increase the maximum mass of strangeon stars with unchanged baryon numbers, enlarging the mass-range of long-lived strangeon stars. During spin-down after merger, the decrease of radius of the remnant will lead to the release of gravitational energy. Taking into account the efficiency of converting the gravitational energy luminosity to the observed X-ray luminosity, we find that the gravitational energy could provide an alternative energy source for the plateau emission of X-ray afterglow. The fitting results of X-ray plateau emission of some short gamma-ray bursts suggest that the magnetic dipole field strength of the remnants can be much smaller than that of expected when the plateau emission is powered only by spin-down luminosity of magnetars.
摘要：
In this study, we compute the electromagnetic and hadronic decay widths of the S-wave fully heavy tetraquark T4Q (Q = c or b) at lowest order in alpha s and v, in the framework of nonrelativistic QCD. The short-distance coefficients are determined through the standard procedure of matching. The nonperturbative long-distance matrix elements are related to the phenomenological four-body Schrodinger wave functions at the origin, whose values are taken from literature. The branching fractions are predicted to be around 10-3 and 10-6 for the T4c hadronic decay and electromagnetic decay, respectively. Combining our results with the T4c production cross sections at the LHC, we also predict the event numbers for various decay channels. With integrated luminosity L = 100 fb-1, it is expected that the event numbers can reach 103-104 for T4c -> gamma gamma, and 105-106 for T4c -> LH, at the LHC. The detecting prospect is promising. In addition, the decay widths of T4b are estimated based on simple dimensional analysis as well as velocity scaling rule.
摘要：
Calculating the thermal rate constants of elementary combustion reactions is of great importance in theoretical chemistry. Machine learning has become a powerful, data-driven method for predicting rate constants nowadays. Recently, the molecular similarity combined with the topological indices were proposed to represent the hydrogen abstraction reactions of alkane [J. Chem. Inf. Model. 2023, 63, 5097-5106], which are, however, not applicable to alkane cracking reactions, another important class of combustion reactions, due to the cleavage of the C-C bond. In this work, a new feature selection scheme is proposed to describe both bimolecular and unimolecular cracking reactions. Molecular descriptors are elaborately selected individually for both reactants and products from those generated by the open-source software RDKit. Machine learning models combined with these molecular descriptors are proven to have the ability to accurately predict rate constants of both the hydrogen abstraction reactions of alkanes by CH(3) and the alkane cracking reactions. The average deviation of the XGB-FNN model for prediction is around 60% for the hydrogen abstraction reactions of alkanes and 100% for the alkane cracking reactions. It is expected that the descriptors proposed in this work can be applied to build machine learning models for other reactions.
作者机构：
[Chang, CH; Ho, Chia-An; Chang, Chun-Hao; Yeh, Hung-Chih; Chen, Chao-Yuan; Ho, Chin-Shan] Natl Taiwan Sport Univ, Grad Inst Sports Sci, Taoyuan City, Taiwan.;[Li, Fang] Cent China Normal Univ, Sch Phys Educ, Wuhan, Hubei, Peoples R China.;[Chen, Chao-Yuan] Natl Taipei Univ Business, Sport Off, Taipei City, Taiwan.
通讯机构：
[Chang, CH ] N;Natl Taiwan Sport Univ, Grad Inst Sports Sci, Taoyuan City, Taiwan.
关键词：
Mechanical property;Myometer;Rowing;Symmetry index
摘要：
BACKGROUND: The mechanical properties of muscles, such as changes in muscle tone and stiffness, are related to sports performance and injuries. Rowers are at increased risk of muscle fatigue and injury during high-repetition and heavy-load cyclic muscle actions. In view of this, the aim of the present study was to investigate the acute effect on muscle tone and stiffness, as well as bilateral muscle asymmetry, in high school rowers after a 2000-meter rowing ergometer test. METHODS: Twelve young male rowers (age = 17.1 ± 0.9 years, body weight = 73.5 ± 9.7 kg) were included in the study. The data of muscle tone (frequency) and stiffness of the posterior deltoids (PD), latissimus dorsi (LD), and rectus femoris (RF) (dominant and non-dominant side) before and after a 2000-m rowing ergometer test were collected using a handheld MyotonPRO device. RESULTS: After the rowing ergometer test, the muscle tone of dominant side PD, LD, and RF were significantly increased (p < 0.05). On the other hand, the muscle stiffness of the non-dominant side LD and RF, as well as the dominant side PD, LD, and RF were significantly increased after the rowing ergometer test (p < 0.05). The muscle tone and stiffness results showed that the dominant side PD, LD, and RF were all significantly higher than the non-dominant side after the rowing ergometer test (p < 0.05), where bilateral PD and RF exhibits moderate asymmetry (5% < symmetry index < 10%). CONCLUSIONS: After a high-intensity and high-load 2000-m rowing ergometer test, PD, LD, and RF showed increases in muscle tone and stiffness, as well as changes in the symmetry of bilateral muscle mechanical properties.
关键词：
Energy splitting of STAR-RIS;time switching of STAR-RIS;UAV-enabled outdoor-to-indoor WPCN;indoor NFZ
摘要：
This letter investigates a Simultaneously Transmitting and Reflecting Reconfigurable Intelligent Surface (STAR-RIS)-assisted unmanned aerial vehicle (UAV)-enabled outdoor-to-indoor (O2I) wireless powered communication network (WPCN), in which the UAV avoids flying over the indoor no-fly zone (NFZ). In the downlink energy transfer (DET) stage, the energy-constrained STAR-RIS and the O2I Internet of Things (IoT) devices harvest energy from the radio frequency (RF) signals of the UAV to self-sustain its operation. In the uplink information transmission (UIT) stage, the IoT devices transmit information to the UAV using the harvested energy, assisted by the STAR-RIS. We introduce the STAR-RIS energy splitting (ES) and time switching (TS) operating protocols in the DET and UIT stages, respectively, to maximize the harvested downlink energy and the achievable uplink sum-rate. Further, an alternating optimization (AO) algorithm based on the penalty method and successive convex approximation (SCA) technology is proposed to solve the resulting highly-coupled non-convex optimization problems, in which the UAV trajectory based on the UAV power consumption model, resource allocation of the O2I IoT devices, and beamforming vectors of the STAR-RIS are jointly optimized. Finally, numerical results demonstrate that our proposed scheme can achieve significant system sum-rate gains that are better than other baseline schemes.
作者机构：
[Sheng, Xin-Li; Sheng, XL] INFN Firenze, Via Giovanni Sansone 1, I-50019 Sesto Fiorentino, FI, Italy.;[Sheng, Xin-Li] Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Oliva, Lucia] Univ Catania, Dept Phys & Astron Ettore Majorana, Via S Sofia 64, I-95123 Catania, Italy.;[Oliva, Lucia] INFN, Sez Catania, Via S Sofia 64, I-95123 Catania, Italy.
通讯机构：
[Sheng, XL ] I;INFN Firenze, Via Giovanni Sansone 1, I-50019 Sesto Fiorentino, FI, Italy.
摘要：
We propose a relativistic theory for spin density matrices of vector mesons based on Kadanoff-Baym equations in the closed-time-path formalism. The theory puts the calculation of spin observables such as the spin density matrix element rho 00 for vector mesons on a solid ground. Within the theory we formulate rho 00 for phi mesons into a factorization form in separation of momentum and spacetime variables. We argue that the main contribution to rho 00 at lower energies should be from the phi fields that can polarize the strange quark and antiquark in the same way as electromagnetic fields. The key observation is that there is correlation inside the phi meson wave function between the phi field that polarizes the strange quark and that polarizes the strange antiquark. This is reflected by the fact that the contributions to rho 00 are all in squares of fields that are nonvanishing even if the fields may strongly fluctuate in spacetime. The fluctuation of strong force fields can be extracted from rho 00 of unflavored vector mesons as links to fundamental properties of quantum chromodynamics.
摘要：
Currently, most fatigue driving detection methods rely on complex neural networks whose feasibility in hardware implementation needs to be further improved. This paper proposes an embedded device-oriented fatigue driving detection method based on a lightweight YOLOv5s. Firstly, a YOLOv5s face detection network with a parametric-free attention mechanism is designed to enhance the focus on face regions during face detection. Then, a practical facial landmark detector model is improved by integrating multi-scale feature fusion with Ghost module, which can adapt to the variations brought by different scale targets. Next, a fatigue determination approach is investigated by using multiple features of the face. Finally, experiments of the proposed detection model with the public YawDD dataset are implemented on the PC platform and the embedded device, respectively. The experimental results demonstrate that the proposed method achieves a detection accuracy of 95.3% and a processing speed of 22FPS on the PC platform. Meanwhile, the hardware test on an Orange Pi5 embedded device achieves a detection accuracy of 93.3% and a processing speed of 12FPS, which has good prospects for applications.
作者机构：
[Wu, Yanwen; Cao, Shuangshuang; Ma, Yanmei; Ge, Di] Cent China Normal Univ, Sch Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Cheng, Yuhang] Shaanxi GSXZ Technol Co Ltd, Xian 710018, Peoples R China.;[Wu, Yanwen] Cent China Normal Univ, Natl Digital Learning Engn Technol Res Ctr, Wuhan 430079, Peoples R China.
通讯机构：
[Wu, YW ] C;Cent China Normal Univ, Sch Phys Sci & Technol, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Natl Digital Learning Engn Technol Res Ctr, Wuhan 430079, Peoples R China.
关键词：
Anomaly detection;Multivariate time-series;Spatiotemporal;Abnormal information expression;Graph contrastive learning
摘要：
The detection of anomalies in high-dimensional time-series has always played a crucial role in the domain of system security. Recently, with rapid advancements in transformer model and graph neural network (GNN) technologies, spatiotemporal modeling approaches for anomaly detection tasks have been greatly improved. However, most methods focus on optimizing upstream time-series prediction tasks by leveraging joint spatiotemporal features. Through experiments, we found that this modeling approach not only risks the loss of some original anomaly information during data preprocessing, but also focuses on optimizing the performance of the upstream prediction task and does not directly enhance the performance of the downstream detection task. We propose a spatiotemporal anomaly detection model that incorporates an improved attention mechanism in the process of temporal modeling. We adopt a heterogeneous graph contrastive learning approach in spatio modeling to compensate for the representation of anomalous behavioral information, thereby guiding the model through thorough training. Through validation on two widely used real-world datasets, we demonstrate that our model outperforms baseline methods. We also explore the impact of multivariate time-series prediction tasks on the detection task, and visualize the reasons behind the benefits gained by our model.
通讯机构：
[Gu, WJ ] Y;[Li, GX ] H;Yangtze Univ, Sch Phys & Optoelect Engn, Jingzhou 434023, Peoples R China.;Huazhong Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
摘要：
We investigate the scattering processes of two photons in a one-dimensional waveguide coupled to two giant atoms. By adjusting the accumulated phase shifts between the coupling points, we are able to effectively manipulate the characteristics of these scattering photons. Utilizing the Lippmann-Schwinger formalism, we derive analytical expressions for the wave functions describing two-photon interaction in separate, braided, and nested configurations. Based on these wave functions, we also obtain analytical expressions for the incoherent power spectra and second-order correlation functions. In contrast to small atoms, the incoherent spectrum, which is defined by the correlation of the bound state, can exhibit more tunability due to the phase shifts. Additionally, the second-order correlation functions in the transmission and reflection fields could be tuned to exhibit either bunching or antibunching upon resonant driving. These unique features offered by the giant atoms in waveguide QED could benefit the generation of nonclassical itinerant photons in quantum networks.
作者机构：
[Yi, Cong; Yi, C; Pu, Shi] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China.;[Wu, Xiang -Yu; Qin, Guang-You] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Wu, Xiang -Yu; Qin, Guang-You] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;[Yang, Di-Lun] Acad Sinica, Inst Phys, Taipei 11529, Taiwan.;[Gao, Jian-Hua] Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Envi, Weihai 264209, Shandong, Peoples R China.
通讯机构：
[Yi, C ] U;Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China.
摘要：
We investigate the azimuthal angle dependent local hydrodynamic helicity polarization of Λ hyperons, defined as the projection of the spin polarization vector along the directions of particle momenta, at BNL Relativistic Heavy Ion Collider beam energy scan energies by utilizing the relativistic ( 3+1 )D CLVisc hydrodynamics framework with SMASH initial conditions. As opposed to local spin polarization at high energy collisions, our hydrodynamic simulations demonstrate that the azimuthal angle dependent helicity polarization induced by the kinetic vorticity dominates over other contributions at intermediate and low collision energies. Our findings provide an opportunity to probe the fine structure of local kinetic vorticity as a function of azimuthal angle at intermediate and low collision energies by mapping our predictions to the future measurements in experiments.
通讯机构：
[Xue, Q ] C;[Xie, GH ] X;Xiamen Univ, Inst Flexible Elect Future Technol, Xiamen 361005, Peoples R China.;Wuhan Univ, Sauvage Ctr Mol Sci, Dept Chem, Hubei Key Lab Organ & Polymer Optoelect Mat, Wuhan 430072, Peoples R China.;Cent China Normal Univ, Dept Phys Sci & Technol, Wuhan 430079, Peoples R China.
摘要：
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is a widely used conductive polymer in organic light-emitting devices. However, its strong acidity and fluorescence quenching effect seriously affect the overall device performance. We report a cost-effective method to address the above concerns by diluting PEDOT:PSS with deionized water, which effectively reduced the film thickness and the acidity. Therefore, the fluorescence quenching occurring at the interface was alleviated. Using the modified PEDOT:PSS as the hole injection layer, the external quantum efficiency of the device could be effectively improved by a factor of 81%, reaching a considerably higher value of 23.5%, compared with the device consisting of the original PEDOT:PSS solution used as received. A cost-effective method to address the issues of strong acidity and exciton quenching of PEDOT:PSS was developed by diluting it with deionized water. The solution-processed organic LEDs achieved almost doubled efficiencies with the modified PEDOT:PSS.
作者机构：
[Qin, Guang-You; Lu, Ye] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Qin, Guang-You; Lu, Ye] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Chen, Chang] Peking Univ, Dept Phys, Beijing 100871, Peoples R China.;[Zheng, Han-Qing] Sichuan Univ, Coll Phys, Chengdu 610065, Peoples R China.
通讯机构：
[Qin, GY ] C;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.
关键词：
exotic hadrons;hadron molecule;X(6900)
摘要：
The attractive interaction between J/psi and psi(3770) has to be strong enough if X(6900) is of the molecule type. We argue that since psi(3770) decays predominantly into a (D) over barD pair, the interactions between J/psi and psi(3770) may be significantly enhanced owing to the three point D (D) over bar loop diagram. The enhancement originates from the anomalous threshold located at t = -1.288 GeV2, whose effect propagates into the s-channel partial wave amplitude in the vicinity of root s similar or equal to 6.94 GeV. This effect may be helpful in the formation of the X(6900) peak.
作者机构：
[Zhu, Lei; Pan, Hu; Li, Jinglin; Li, Yixin; Wang, Zhouzhou; Zhou, Baowen; Yu, Tianqi; Zhou, BW] Shanghai Jiao Tong Univ, Res Ctr Renewable Synthet Fuel, Sch Mech Engn, Key Lab Power Machinery & Engn,Minist Educ, Shanghai 200240, Peoples R China.;[Wang, Zhouzhou; Yu, Ying] Cent China Normal Univ, Inst Nanosci & Nanotechnol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Song, Jun; Song, J; Chen, Yiqing] McGill Univ, Dept Min & Mat Engn, Montreal, PQ H3A0C9, Canada.;[Wang, Xinqiang; Sheng, Bowen; Wang, Ping; Wang, XQ] Peking Univ, Nanooptoelectron Frontier Ctr Minist Educ NFC MOE, Sch Phys, State Key Lab Artificial Microstruct & Mesoscop Ph, Beijing 100871, Peoples R China.;[Yao, Lin] Shanghai Jiao Tong Univ, China UK Low Carbon Coll, Shanghai 201306, Peoples R China.
通讯机构：
[Wang, XQ ] P;[Song, J ] M;[Zhou, BW ] S;Shanghai Jiao Tong Univ, Res Ctr Renewable Synthet Fuel, Sch Mech Engn, Key Lab Power Machinery & Engn,Minist Educ, Shanghai 200240, Peoples R China.;McGill Univ, Dept Min & Mat Engn, Montreal, PQ H3A0C9, Canada.
关键词：
Air-promoted strategy;Bioethanol reforming;Core/shell Cr2O3@GaN nanoarchitecture;High TOF/TON;Photocatalytic H2 production
摘要：
Light-driven hydrogen production from biomass derivatives offers a path towards carbon neutrality. It is often however operated with the limitations of sluggish kinetics and severe coking. Herein, a disruptive air-promoted strategy is explored for efficient and durable light-driven hydrogen production from ethanol over a core/shell Cr(2)O(3)@GaN nanoarchitecture. The correlative computational and experimental investigations show ethanol is energetically favorable to be adsorbed on the Cr(2)O(3)@GaN interface, followed by dehydrogenation toward acetaldehyde and protons by photoexcited holes. The released protons are then consumed for H(2) evolution by photogenerated electrons. Afterward, O(2) can be evolved into active oxygen species and promote the deprotonation and C-C cleavage of the key C(2) intermediate, thus significantly lowering the reaction energy barrier of hydrogen evolution and removing the carbon residual with inhibited overoxidation. Consequently, hydrogen is produced at a high rate of 76.9 mole H(2) per gram Cr(2)O(3)@GaN per hour by only feeding ethanol, air, and light, leading to the achievement of a turnover number of 266,943,000 mole H(2) per mole Cr(2)O(3) over a long-term operation of 180 hours. Notably, an unprecedented light-to-hydrogen efficiency of 17.6 % is achieved under concentrated light illumination. The simultaneous generation of aldehyde from ethanol dehydrogenation enables the process more economically promising.
摘要：
The HIV-1 transactivator protein Tat interacts with the transactivation response element (TAR) at the three-nucleotide UCU bulge to facilitate the recruitment of transcription elongation factor-b (P-TEFb) and induce the transcription of the integrated proviral genome. Therefore, the Tat-TAR interaction, unique to the virus, is a promising target for developing antiviral therapeutics. Currently, there are no FDA-approved drugs against HIV-1 transcription, suggesting the need to develop novel inhibitors that specifically target HIV-1 transcription. We have identified potential candidates that effectively inhibit viral transcription in myeloid and T cells without apparent toxicity. Among these candidates, two molecules showed inhibition of viral protein expression. A molecular docking and simulation approach was used to determine the binding dynamics of these small molecules on TAR RNA in the presence of the P-TEFb complex, which was further validated by a biotinylated RNA pulldown assay. Furthermore, we examined the effect of these molecules on transcription factors, including the SWI/SNF complex (BAF or PBAF), which plays an important role in chromatin remodeling near the transcription start site and hence regulates virus transcription. The top candidates showed significant viral transcription inhibition in primary cells infected with HIV-1 (98.6). Collectively, our study identified potential transcription inhibitors that can potentially complement existing cART drugs to address the current therapeutic gap in current regimens. Additionally, shifting of the TAR RNA loop towards Cyclin T1 upon molecule binding during molecular simulation studies suggested that targeting the TAR loop and Tat-binding UCU bulge together should be an essential feature of TAR-binding molecules/inhibitors to achieve complete viral transcription inhibition.
通讯机构：
[Tang, YW ] C;Cent China Normal Univ, Inst Nanosci & Technol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
关键词：
Metal organic framework;Core-shell;Ostwald ripening;Aqueous zinc -ion batteries
摘要：
The nanostructure designing strategy is one of the most effective methods to carry out the optimization of cathode materials for aqueous zinc ion batteries (ARZIBs). The design and synthesis of materials with stable nanostructure and short ion/electron transport paths are expected to alleviate the dilemma faced by vanadiumbased materials, such as poor electrical conductivity and structural changes. Ostwald ripening is a promising option in the design and fabrication of special nanostructures such as hollow and core shells. Selecting vanadiumbased metal-organic frameworks (V-MOF) as reactants, we successfully obtained vanadium oxide precursors with self-growing core-shell structures in one-step. As the reaction time increases, the vanadium oxide precursors undergo the process of microspheres -> core-shell -> yolk shell, which is thought to be the result of Ostwald ripening. After annealing, the vanadium oxide precursor becomes a "core-shell" structure vanadium pentoxide (core-shell V2O5). The ARZIBs assembled with core-shell V2O5 cathodes showed superior capacity (309.4 mAh/g at 0.1 A/g) and cycling stability (91.4 % capacity retention after 4000 cycles at 3A/g). Hence, we successfully realized the self-growth of vanadium oxide with core-shell structure in one step but also revealed the crystallization process based on Ostwald ripening and its zinc storage mechanism, which provides new possibilities for the facile synthesis of special nanostructured ARZIB cathode materials.
期刊：
Microwave and Optical Technology Letters,2024年66(1):e33954- ISSN：0895-2477
通讯作者：
Jin, J
作者机构：
[Ma, Li; Liu, Wei] Tianjin Univ, Sch Microelect, Tianjin, Peoples R China.;[Zhang, Qi-Jun] Carleton Univ, Dept Elect, Ottawa, ON, Canada.;[Jin, Jing] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Peoples R China.;[Zhang, Jianan] Southeast Univ, State Key Lab Millimeter Waves, Nanjing, Peoples R China.
通讯机构：
[Jin, J ] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Peoples R China.
关键词：
electromagnetic;finite element method;Padé via Arnoldi;single-size simplification
摘要：
Abstract This paper proposes a new Padé via Arnoldi algorithm with single‐size matrix simplification for electromagnetic (EM) fast frequency sweep. New equations are derived to reduce the double‐size system matrix to single‐size system matrix. We also propose a systematic algorithm to calculate S‐parameters using the simplified single‐size system matrix. Using the proposed algorithm, the EM responses can be obtained with the same accuracy while consuming much less time compared with that using the existing double‐size matrix Padé via Lanczos. The proposed algorithm is demonstrated by two microwave examples.
摘要：
The main goal of this paper is to investigate the predefined-time sliding mode control and synchronization of uncertain hyperchaotic systems and its application in secure communication. Firstly, a novel predefined-time sliding surface is designed. Then a predefined-time sliding mode controller is proposed for uncertain hyperchaotic systems, which can guarantee synchronization of the master-slave system within a predefined time in the presence of parameter uncertain and external disturbance. Specially, the settling time, as a part of control parameters, can be predefined as needed independent of initial conditions. Furthermore, the validity of the proposed approach is proved by Lyapunov stability theory. Finally, comparative tests and image encryption application are given to show advantages of the proposed method.
期刊：
EUROPEAN PHYSICAL JOURNAL PLUS,2024年139(3):1-7 ISSN：2190-5444
通讯作者：
Zhang, ZQ
作者机构：
[Zhang, Zi-qiang; Zhang, ZQ] China Univ Geosci, Sch Math & Phys, Wuhan 430074, Peoples R China.;[Hou, De-fu] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.
通讯机构：
[Zhang, ZQ ] C;China Univ Geosci, Sch Math & Phys, Wuhan 430074, Peoples R China.
摘要：
Using the AdS/CFT correspondence, we study finite 't Hooft coupling corrections on the instantaneous energy loss of light quarks within shooting string. We consider the first higher-derivative corrections to the supergravity theory, which are R4\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$R<^>4$$\end{document} terms in the gravity action. It turns out that the energy loss decreases with decreasing lambda\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\lambda$$\end{document} ('t Hooft coupling constant), in agreement with previous findings of the light quarks energy loss obtained from the jet quenching parameter and stopping distance. In addition, we discuss how the energy loss changes with the shear viscosity to entropy density ratio at strong coupling.
作者机构：
[Chang, Wen-Bin] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOS, Wuhan, Peoples R China.
通讯机构：
[Chang, WB ] C;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
In this study, we utilize the complexity-action duality to study the evolution of complexity in a holographic QCD model at finite temperature and chemical potential. By inserting a fundamental string as a probe, we investigated the properties of complexity growth in this Einstein-Maxwell-scalar gravity system, which is affected by the string velocity, chemical potential, and temperature. Our results show that the complexity growth is maximized when the probe string is stationary, and it decreases as the velocity of the string increases. When the string approaches relativistic velocities, the complexity growth always increases monotonically with respect to the chemical potential. Furthermore, we find that the complexity growth can be used to identify phase transitions and crossovers in the model.
期刊：
EUROPEAN PHYSICAL JOURNAL C,2024年84(3):1-13 ISSN：1434-6044
通讯作者：
Sheng, XL
作者机构：
[Hou, Defu; Sheng, Xin-Li; Yang, Shu-Yun; Zou, Yao-Lin; Sheng, XL] Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, Wuhan 430079, Peoples R China.;[Hou, Defu; Sheng, Xin-Li; Yang, Shu-Yun; Zou, Yao-Lin; Sheng, XL] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Sheng, Xin-Li; Sheng, XL] INFN, Sez Firenze, Via G Sansone 1, I-50019 Florence, Italy.
通讯机构：
[Sheng, XL ] C;Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;INFN, Sez Firenze, Via G Sansone 1, I-50019 Florence, Italy.
摘要：
Based on the Nambu–Jona–Lasinio (NJL) model, we develop a framework for calculating the spin alignment of vector mesons and applied it to study
$$\phi $$
mesons in a magnetic field. We calculate mass spectra for
$$\phi $$
mesons and observe mass splitting between the longitudinally polarized state and transversely polarized states. The
$$\phi $$
meson in a thermal equilibrium system is preferred to occupy the state with spin
$$\lambda =0$$
than those with spin
$$\lambda =\pm 1$$
, because the former state has a smaller energy. As a consequence, we conclude that the spin alignment will be larger than 1/3 if one measures along the direction of the magnetic field, which is qualitatively consistent with the recent STAR data. Around the critical temperature
$$T_{C}=150~\hbox {MeV}$$
, the positive deviation from 1/3 is proportional to the square of the magnetic field strength, which agrees with the result from the non-relativistic coalescence model. Including the anomalous magnetic moments for quarks will modify the dynamical masses of quarks and thus affect the mass spectra and spin alignment of
$$\phi $$
mesons. The discussion of spin alignment in the NJL model may help us better understand the formation of hadron’s spin structure during the chiral phase transition.
